Exif processing with Ruby

exif.rb

#!/usr/bin/env ruby
require "mini_exiftool_vendored"
require 'mini_exiftool'

images_directory = ARGV[0]

puts "Processing images in directory: #{images_directory}"

images_list = Dir.entries(images_directory).reject{ |d| d.start_with?(".") }.reject {|d| !d.end_with?("jpg") }.sort

def update_user_comment(filename, new_user_comment)
  photo = MiniExiftool.new(filename)
  photo.UserComment = new_user_comment
  photo.save
end

images_list.each do |file|
  relPath = "#{images_directory}/#{file}"
  puts "Updated copyright for: #{relPath}"
  update_user_comment(relPath, "Travis Truman")
end